electrically stimulated ganglion cells. 27 



Explanation op Plate. 



Fig. 1. — Cat No. 11. Left 1st thoracic ganglion, 

 resting. A portion of single field. Nuclei full and 

 round, protoplasm darkly stained. 



Fig. 3. — Cat No. 11. Right 1st thoracic ganglion 

 worked, not severely, 10 hours. Cells a and h are 

 adjoining cells, taken from a slightly more central 

 portion of the section, and show an appearance of the 

 nucleus, shrunken away from the cell protoplasm, quite 

 characteristic for central portions of the worked 

 ganglion, but not of the resting. 



Fig. i.— Cat No. 1. Cell from left 1st thoracic 

 ganglion, resting. Adjoining cells outlined in part. 



Fig. 4.— Oai No. 1. Cell from right 1st thoracic 

 ganglion, worked severely 7 hours. Nucleus much 

 shrunken and protoplasm vacuolated. 1 and 1' two 

 larger vacuoles. 



Note. — All the above figures were drawn under a 

 magnification of Leitz Obj. 7, Oc. 3 (=600 diameters), 

 and the cells, nuclei and nuclei of capsule were out- 

 lined by the aid of a Zeiss camera lucida after Abbe 

 (the form with the longer arm). 



Figs. 1 and 2, staining with osmic acid. 



Figs. 3 and 4, staining with osmic acid followed by 

 Gaule's quadruple stain. 



